Photos: The Line wildfire in Southern California burns over 20,000 acres and forces thousands of evacuations

The “Line Fire,” a fast-moving wildfire fueled by extremely high temperatures in San Bernardino County, Calif., has scorched more than 20,000 acres of land and forced thousands of Southern California residents to evacuate over the weekend.

As of Monday morning, the wildfire — which first broke out on Thursday evening — is 3% contained as more than 600 firefighters battle to contain the flames. California firefighters also warned that areas of smoke “could become more widespread in the afternoon.”

California Gov. Gavin Newsom declared a state of emergency Saturday night in San Bernardino County, which is located a little over 60 miles east of Los Angeles. The declaration allowed the state to secure additional federal fire management assistance.

"I thank President Biden for his swift approval of support for the work of our firefighters and first responders battling this fire and protecting local communities," Newsom said in a statement. "It's critical that residents in the impacted areas remain vigilant and prepare to evacuate immediately if called for by local authorities."

More than 36,000 structures are being threatened, California firefighters reported Monday, including homes and businesses in the wildfire’s path.

The Line Fire has been fueled by a late-summer heat wave. An excessive heat warning is in place until Monday night as meteorologists predict temperatures to climb up to 108 degrees as the fire spreads in the northeast direction.

The cause of the wildfire is under investigation.

Wildfire as soon from a road.
The Line Fire overtakes Highway 330 in Highland, Calif., on Sept. 7. (Jon Putman/SOPA Images/LightRocket via Getty Images) (SOPA Images via Getty Images)
A water-dropping helicopter over flames.
A water-dropping helicopter battles the Line Fire growing in San Bernardino, Calif., on Sept. 8. (Qian Weizhong/VCG via Getty Images) (VCG via Getty Images)
People watch a hillside burn from a highway.
People watch a hillside burn on Highway 38 as the Line Fire advances in Mentone, Calif., on Sept. 8. (Eric Thayer/AP) (ASSOCIATED PRESS)
A fire tanker makes a retardant drop over a hillside.
A fire tanker makes a retardant drop in Highland, Calif., on Sept. 7. (Jon Putman/SOPA Images/LightRocket via Getty Images) (SOPA Images via Getty Images)
An aerial view of a mix of rain and smoke over a hillside.
An aerial view of a mix of rain and smoke from the nearby Line Fire over San Bernardino, Calif., on Sept. 8. (David McNew/Getty Images) (David McNew via Getty Images)
People watch as a fire advances.
People watch as the Line Fire advances in Mentone, Calif., on Sept. 8. (Eric Thayer/AP) (ASSOCIATED PRESS)
Firefighters look on as a fire grows.
Firefighters look on as the Line Fire grows in San Bernardino, Calif., on Sept. 8. (Qian Weizhong/VCG via Getty Images) (VCG via Getty Images)
Motorists line up.
Motorists line up in the outskirts of town in Running Springs, Calif., on Sept. 7. (Eric Thayer/AP) (ASSOCIATED PRESS)
Flames seen behind a home.
Flames from the Line Fire ignite over a residence in Highland, Calif., on Sept. 7. (Eric Thayer/AP) (ASSOCIATED PRESS)
Firefighters at work.
Firefighters work against the advancing Line Fire in Mentone, Calif., on Sept. 8. (Eric Thayer/AP) (ASSOCIATED PRESS)

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